Phase-field Modeling of Heat Treatment Process with Variable Temperature and Its Parameter Calibration

Abstract

For the research of heat treatment technology of aero-engine turbine discs with dual-performance, the experimental methods are mostly used to establish the database of heat treatment technology of turbine disk alloys. However, the experimental methods have a long research period and high cost. A phase field model that can be used to predict the grain evolution during heat treatment process with variable temperature is proposed. To simulate the grain evolution of superalloy at different heat treatment temperatures, the phase field model is improved by introducing the Arrhenius relationship, which describes the quantitative relationship between the grain boundary movement and temperature. Based on the improved phase field model and fitted model parameters, the grain average size and morphology evolution of superalloy FGH96 during the longer heat treatment process are simulated, and the simulated results are compared with the experimental results. The results show that the calculated data coincide with the experiment data, the evolution law of grain is consistent with the experimental observation and theoretical analysis. These results prove that the grain boundary mobility M in the Arrhenius relationship is suitable for simulating the heat treatment process at the corresponding temperature. At the same time, the feasibility of the improved method and accuracy of the fitted parameters of the phase-field model are verified.

Keywords

• aeroengine turbine disk
• grain evolution
• phase field model
• arrhenius relationship
• grain boundary mobility
• heat treatment